docs: def swap(self, old_chunks, new_chunk):
      """Swaps old consecutive chunks with new chunk.
  
      Args:
        old_chunks (:obj:`budou.chunk.ChunkList`): List of consecutive Chunks to
            be removed.
        new_chunk (:obj:`budou.chunk.Chunk`): A Chunk to be inserted.
      """
      indexes = [self.index(chunk) for chunk in old_chunks]
      del self[indexes[0]:indexes[-1] + 1]
      self.insert(indexes[0], new_chunk)